We will now benchmark the HFS entanglement of the H atom against the two-qubit spin–spin entanglement in a one-dimensional (1D) Heisenberg chain (HC) [1]}. To this end, we consider two spins in a 1D Heisenberg chain driven by an external magnetic field \(B\)  governed by an interaction Hamiltonian
\(H_s=J\sigma _1\cdot \sigma _2+\mu _B B (\sigma _1^z+\sigma _2^z),\) 
